[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / gpu / drm / drm_ioctl.c

/**
 * \file drm_ioctl.c
 * IOCTL processing for DRM
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * Created: Fri Jan  8 09:01:26 1999 by faith@valinux.com
 *
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include "drmP.h"
#include "drm_core.h"

#include "linux/pci.h"

/**
 * Get the bus id.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_unique structure.
 * \return zero on success or a negative number on failure.
 *
 * Copies the bus id from drm_device::unique into user space.
 */
int drm_getunique(struct drm_device *dev, void *data,
		  struct drm_file *file_priv)
{
	struct drm_unique *u = data;
	struct drm_master *master = file_priv->master;

	if (u->unique_len >= master->unique_len) {
		if (copy_to_user(u->unique, master->unique, master->unique_len))
			return -EFAULT;
	}
	u->unique_len = master->unique_len;

	return 0;
}

/**
 * Set the bus id.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_unique structure.
 * \return zero on success or a negative number on failure.
 *
 * Copies the bus id from userspace into drm_device::unique, and verifies that
 * it matches the device this DRM is attached to (EINVAL otherwise).  Deprecated
 * in interface version 1.1 and will return EBUSY when setversion has requested
 * version 1.1 or greater.
 */
int drm_setunique(struct drm_device *dev, void *data,
		  struct drm_file *file_priv)
{
	struct drm_unique *u = data;
	struct drm_master *master = file_priv->master;
	int domain, bus, slot, func, ret;

	if (master->unique_len || master->unique)
		return -EBUSY;

	if (!u->unique_len || u->unique_len > 1024)
		return -EINVAL;

	master->unique_len = u->unique_len;
	master->unique_size = u->unique_len + 1;
	master->unique = drm_alloc(master->unique_size, DRM_MEM_DRIVER);
	if (!master->unique)
		return -ENOMEM;
	if (copy_from_user(master->unique, u->unique, master->unique_len))
		return -EFAULT;

	master->unique[master->unique_len] = '\0';

	dev->devname =
	    drm_alloc(strlen(dev->driver->pci_driver.name) +
		      strlen(master->unique) + 2, DRM_MEM_DRIVER);
	if (!dev->devname)
		return -ENOMEM;

	sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
		master->unique);

	/* Return error if the busid submitted doesn't match the device's actual
	 * busid.
	 */
	ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
	if (ret != 3)
		return -EINVAL;
	domain = bus >> 8;
	bus &= 0xff;

	if ((domain != drm_get_pci_domain(dev)) ||
	    (bus != dev->pdev->bus->number) ||
	    (slot != PCI_SLOT(dev->pdev->devfn)) ||
	    (func != PCI_FUNC(dev->pdev->devfn)))
		return -EINVAL;

	return 0;
}

static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
{
	struct drm_master *master = file_priv->master;
	int len;

	if (master->unique != NULL)
		return -EBUSY;

	master->unique_len = 40;
	master->unique_size = master->unique_len;
	master->unique = drm_alloc(master->unique_size, DRM_MEM_DRIVER);
	if (master->unique == NULL)
		return -ENOMEM;

	len = snprintf(master->unique, master->unique_len, "pci:%04x:%02x:%02x.%d",
		       drm_get_pci_domain(dev),
		       dev->pdev->bus->number,
		       PCI_SLOT(dev->pdev->devfn),
		       PCI_FUNC(dev->pdev->devfn));
	if (len >= master->unique_len)
		DRM_ERROR("buffer overflow");
	else
		master->unique_len = len;

	dev->devname =
	    drm_alloc(strlen(dev->driver->pci_driver.name) + master->unique_len +
		      2, DRM_MEM_DRIVER);
	if (dev->devname == NULL)
		return -ENOMEM;

	sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
		master->unique);

	return 0;
}

/**
 * Get a mapping information.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_map structure.
 *
 * \return zero on success or a negative number on failure.
 *
 * Searches for the mapping with the specified offset and copies its information
 * into userspace
 */
int drm_getmap(struct drm_device *dev, void *data,
	       struct drm_file *file_priv)
{
	struct drm_map *map = data;
	struct drm_map_list *r_list = NULL;
	struct list_head *list;
	int idx;
	int i;

	idx = map->offset;

	mutex_lock(&dev->struct_mutex);
	if (idx < 0) {
		mutex_unlock(&dev->struct_mutex);
		return -EINVAL;
	}

	i = 0;
	list_for_each(list, &dev->maplist) {
		if (i == idx) {
			r_list = list_entry(list, struct drm_map_list, head);
			break;
		}
		i++;
	}
	if (!r_list || !r_list->map) {
		mutex_unlock(&dev->struct_mutex);
		return -EINVAL;
	}

	map->offset = r_list->map->offset;
	map->size = r_list->map->size;
	map->type = r_list->map->type;
	map->flags = r_list->map->flags;
	map->handle = (void *)(unsigned long) r_list->user_token;
	map->mtrr = r_list->map->mtrr;
	mutex_unlock(&dev->struct_mutex);

	return 0;
}

/**
 * Get client information.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_client structure.
 *
 * \return zero on success or a negative number on failure.
 *
 * Searches for the client with the specified index and copies its information
 * into userspace
 */
int drm_getclient(struct drm_device *dev, void *data,
		  struct drm_file *file_priv)
{
	struct drm_client *client = data;
	struct drm_file *pt;
	int idx;
	int i;

	idx = client->idx;
	mutex_lock(&dev->struct_mutex);

	i = 0;
	list_for_each_entry(pt, &dev->filelist, lhead) {
		if (i++ >= idx) {
			client->auth = pt->authenticated;
			client->pid = pt->pid;
			client->uid = pt->uid;
			client->magic = pt->magic;
			client->iocs = pt->ioctl_count;
			mutex_unlock(&dev->struct_mutex);

			return 0;
		}
	}
	mutex_unlock(&dev->struct_mutex);

	return -EINVAL;
}

/**
 * Get statistics information.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_stats structure.
 *
 * \return zero on success or a negative number on failure.
 */
int drm_getstats(struct drm_device *dev, void *data,
		 struct drm_file *file_priv)
{
	struct drm_stats *stats = data;
	int i;

	memset(stats, 0, sizeof(*stats));

	mutex_lock(&dev->struct_mutex);

	for (i = 0; i < dev->counters; i++) {
		if (dev->types[i] == _DRM_STAT_LOCK)
			stats->data[i].value =
			    (file_priv->master->lock.hw_lock ? file_priv->master->lock.hw_lock->lock : 0);
		else
			stats->data[i].value = atomic_read(&dev->counts[i]);
		stats->data[i].type = dev->types[i];
	}

	stats->count = dev->counters;

	mutex_unlock(&dev->struct_mutex);

	return 0;
}

/**
 * Setversion ioctl.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_lock structure.
 * \return zero on success or negative number on failure.
 *
 * Sets the requested interface version
 */
int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
	struct drm_set_version *sv = data;
	int if_version, retcode = 0;

	if (sv->drm_di_major != -1) {
		if (sv->drm_di_major != DRM_IF_MAJOR ||
		    sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
			retcode = -EINVAL;
			goto done;
		}
		if_version = DRM_IF_VERSION(sv->drm_di_major,
					    sv->drm_di_minor);
		dev->if_version = max(if_version, dev->if_version);
		if (sv->drm_di_minor >= 1) {
			/*
			 * Version 1.1 includes tying of DRM to specific device
			 */
			drm_set_busid(dev, file_priv);
		}
	}

	if (sv->drm_dd_major != -1) {
		if (sv->drm_dd_major != dev->driver->major ||
		    sv->drm_dd_minor < 0 || sv->drm_dd_minor >
		    dev->driver->minor) {
			retcode = -EINVAL;
			goto done;
		}

		if (dev->driver->set_version)
			dev->driver->set_version(dev, sv);
	}

done:
	sv->drm_di_major = DRM_IF_MAJOR;
	sv->drm_di_minor = DRM_IF_MINOR;
	sv->drm_dd_major = dev->driver->major;
	sv->drm_dd_minor = dev->driver->minor;

	return retcode;
}

/** No-op ioctl. */
int drm_noop(struct drm_device *dev, void *data,
	     struct drm_file *file_priv)
{
	DRM_DEBUG("\n");
	return 0;
}
Commit	Line	Data
1da177e4	1	/**
b5e89ed5	2	* \file drm_ioctl.c
1da177e4 LT	3	* IOCTL processing for DRM
	4	*
	5	* \author Rickard E. (Rik) Faith <faith@valinux.com>
	6	* \author Gareth Hughes <gareth@valinux.com>
	7	*/
	8
	9	/*
	10	* Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com
	11	*
	12	* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
	13	* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
	14	* All Rights Reserved.
	15	*
	16	* Permission is hereby granted, free of charge, to any person obtaining a
	17	* copy of this software and associated documentation files (the "Software"),
	18	* to deal in the Software without restriction, including without limitation
	19	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	20	* and/or sell copies of the Software, and to permit persons to whom the
	21	* Software is furnished to do so, subject to the following conditions:
	22	*
	23	* The above copyright notice and this permission notice (including the next
	24	* paragraph) shall be included in all copies or substantial portions of the
	25	* Software.
	26	*
	27	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	28	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	29	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	30	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	31	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	32	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	33	* OTHER DEALINGS IN THE SOFTWARE.
	34	*/
	35
	36	#include "drmP.h"
	37	#include "drm_core.h"
	38
	39	#include "linux/pci.h"
	40
	41	/**
	42	* Get the bus id.
b5e89ed5	43	*
1da177e4	44	* \param inode device inode.
6c340eac	45	* \param file_priv DRM file private.
1da177e4 LT	46	* \param cmd command.
	47	* \param arg user argument, pointing to a drm_unique structure.
	48	* \return zero on success or a negative number on failure.
	49	*
	50	* Copies the bus id from drm_device::unique into user space.
	51	*/
c153f45f EA	52	int drm_getunique(struct drm_device dev, void data,
c153f45f EA	53	struct drm_file *file_priv)
1da177e4	54	{
c153f45f	55	struct drm_unique *u = data;
7c1c2871	56	struct drm_master *master = file_priv->master;
1da177e4	57
7c1c2871 DA	58	if (u->unique_len >= master->unique_len) {
7c1c2871 DA	59	if (copy_to_user(u->unique, master->unique, master->unique_len))
1da177e4 LT	60	return -EFAULT;
1da177e4 LT	61	}
7c1c2871	62	u->unique_len = master->unique_len;
c153f45f	63
1da177e4 LT	64	return 0;
	65	}
	66
	67	/**
	68	* Set the bus id.
b5e89ed5	69	*
1da177e4	70	* \param inode device inode.
6c340eac	71	* \param file_priv DRM file private.
1da177e4 LT	72	* \param cmd command.
	73	* \param arg user argument, pointing to a drm_unique structure.
	74	* \return zero on success or a negative number on failure.
	75	*
	76	* Copies the bus id from userspace into drm_device::unique, and verifies that
	77	* it matches the device this DRM is attached to (EINVAL otherwise). Deprecated
	78	* in interface version 1.1 and will return EBUSY when setversion has requested
	79	* version 1.1 or greater.
	80	*/
c153f45f EA	81	int drm_setunique(struct drm_device dev, void data,
c153f45f EA	82	struct drm_file *file_priv)
1da177e4	83	{
c153f45f	84	struct drm_unique *u = data;
7c1c2871	85	struct drm_master *master = file_priv->master;
b5e89ed5	86	int domain, bus, slot, func, ret;
1da177e4	87
7c1c2871	88	if (master->unique_len \|\| master->unique)
b5e89ed5	89	return -EBUSY;
1da177e4	90
c153f45f	91	if (!u->unique_len \|\| u->unique_len > 1024)
b5e89ed5	92	return -EINVAL;
1da177e4	93
7c1c2871	94	master->unique_len = u->unique_len;
1147c9cd VN	95	master->unique_size = u->unique_len + 1;
1147c9cd VN	96	master->unique = drm_alloc(master->unique_size, DRM_MEM_DRIVER);
7c1c2871	97	if (!master->unique)
b5e89ed5	98	return -ENOMEM;
7c1c2871	99	if (copy_from_user(master->unique, u->unique, master->unique_len))
1da177e4 LT	100	return -EFAULT;
1da177e4 LT	101
7c1c2871	102	master->unique[master->unique_len] = '\0';
1da177e4	103
b5e89ed5 DA	104	dev->devname =
b5e89ed5 DA	105	drm_alloc(strlen(dev->driver->pci_driver.name) +
7c1c2871	106	strlen(master->unique) + 2, DRM_MEM_DRIVER);
1da177e4 LT	107	if (!dev->devname)
	108	return -ENOMEM;
	109
b5e89ed5	110	sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
7c1c2871	111	master->unique);
1da177e4 LT	112
	113	/* Return error if the busid submitted doesn't match the device's actual
	114	* busid.
	115	*/
7c1c2871	116	ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
1da177e4	117	if (ret != 3)
20caafa6	118	return -EINVAL;
1da177e4 LT	119	domain = bus >> 8;
1da177e4 LT	120	bus &= 0xff;
b5e89ed5	121
33229601	122	if ((domain != drm_get_pci_domain(dev)) \|\|
242ef0e1 D	123	(bus != dev->pdev->bus->number) \|\|
	124	(slot != PCI_SLOT(dev->pdev->devfn)) \|\|
	125	(func != PCI_FUNC(dev->pdev->devfn)))
1da177e4 LT	126	return -EINVAL;
	127
	128	return 0;
	129	}
	130
7c1c2871	131	static int drm_set_busid(struct drm_device dev, struct drm_file file_priv)
1da177e4	132	{
7c1c2871	133	struct drm_master *master = file_priv->master;
fe34765b DA	134	int len;
fe34765b DA	135
7c1c2871 DA	136	if (master->unique != NULL)
7c1c2871 DA	137	return -EBUSY;
1da177e4	138
7c1c2871	139	master->unique_len = 40;
1147c9cd VN	140	master->unique_size = master->unique_len;
1147c9cd VN	141	master->unique = drm_alloc(master->unique_size, DRM_MEM_DRIVER);
7c1c2871	142	if (master->unique == NULL)
1f27ce6a	143	return -ENOMEM;
1da177e4	144
7c1c2871 DA	145	len = snprintf(master->unique, master->unique_len, "pci:%04x:%02x:%02x.%d",
	146	drm_get_pci_domain(dev),
	147	dev->pdev->bus->number,
242ef0e1 D	148	PCI_SLOT(dev->pdev->devfn),
242ef0e1 D	149	PCI_FUNC(dev->pdev->devfn));
1147c9cd	150	if (len >= master->unique_len)
7c1c2871	151	DRM_ERROR("buffer overflow");
1147c9cd VN	152	else
1147c9cd VN	153	master->unique_len = len;
fe34765b	154
b5e89ed5	155	dev->devname =
7c1c2871	156	drm_alloc(strlen(dev->driver->pci_driver.name) + master->unique_len +
b5e89ed5	157	2, DRM_MEM_DRIVER);
1da177e4	158	if (dev->devname == NULL)
1f27ce6a	159	return -ENOMEM;
1da177e4	160
b5e89ed5	161	sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
7c1c2871	162	master->unique);
1da177e4 LT	163
	164	return 0;
	165	}
	166
1da177e4 LT	167	/**
	168	* Get a mapping information.
	169	*
	170	* \param inode device inode.
6c340eac	171	* \param file_priv DRM file private.
1da177e4 LT	172	* \param cmd command.
1da177e4 LT	173	* \param arg user argument, pointing to a drm_map structure.
b5e89ed5	174	*
1da177e4 LT	175	* \return zero on success or a negative number on failure.
	176	*
	177	* Searches for the mapping with the specified offset and copies its information
	178	* into userspace
	179	*/
c153f45f EA	180	int drm_getmap(struct drm_device dev, void data,
c153f45f EA	181	struct drm_file *file_priv)
1da177e4	182	{
c153f45f	183	struct drm_map *map = data;
55910517	184	struct drm_map_list *r_list = NULL;
1da177e4	185	struct list_head *list;
b5e89ed5 DA	186	int idx;
b5e89ed5 DA	187	int i;
1da177e4	188
c153f45f	189	idx = map->offset;
1da177e4	190
30e2fb18	191	mutex_lock(&dev->struct_mutex);
1da177e4	192	if (idx < 0) {
30e2fb18	193	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	194	return -EINVAL;
	195	}
	196
	197	i = 0;
bd1b331f	198	list_for_each(list, &dev->maplist) {
b5e89ed5	199	if (i == idx) {
55910517	200	r_list = list_entry(list, struct drm_map_list, head);
1da177e4 LT	201	break;
	202	}
	203	i++;
	204	}
b5e89ed5	205	if (!r_list \|\| !r_list->map) {
30e2fb18	206	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	207	return -EINVAL;
	208	}
	209
c153f45f EA	210	map->offset = r_list->map->offset;
	211	map->size = r_list->map->size;
	212	map->type = r_list->map->type;
	213	map->flags = r_list->map->flags;
	214	map->handle = (void *)(unsigned long) r_list->user_token;
	215	map->mtrr = r_list->map->mtrr;
30e2fb18	216	mutex_unlock(&dev->struct_mutex);
1da177e4	217
1da177e4 LT	218	return 0;
	219	}
	220
	221	/**
	222	* Get client information.
	223	*
	224	* \param inode device inode.
6c340eac	225	* \param file_priv DRM file private.
1da177e4 LT	226	* \param cmd command.
1da177e4 LT	227	* \param arg user argument, pointing to a drm_client structure.
b5e89ed5	228	*
1da177e4 LT	229	* \return zero on success or a negative number on failure.
	230	*
	231	* Searches for the client with the specified index and copies its information
	232	* into userspace
	233	*/
c153f45f EA	234	int drm_getclient(struct drm_device dev, void data,
c153f45f EA	235	struct drm_file *file_priv)
1da177e4	236	{
c153f45f	237	struct drm_client *client = data;
84b1fd10	238	struct drm_file *pt;
b5e89ed5 DA	239	int idx;
b5e89ed5 DA	240	int i;
1da177e4	241
c153f45f	242	idx = client->idx;
30e2fb18	243	mutex_lock(&dev->struct_mutex);
bc5f4523	244
bd1b331f DA	245	i = 0;
bd1b331f DA	246	list_for_each_entry(pt, &dev->filelist, lhead) {
b018fcda EA	247	if (i++ >= idx) {
	248	client->auth = pt->authenticated;
	249	client->pid = pt->pid;
	250	client->uid = pt->uid;
	251	client->magic = pt->magic;
	252	client->iocs = pt->ioctl_count;
	253	mutex_unlock(&dev->struct_mutex);
	254
	255	return 0;
	256	}
bd1b331f	257	}
30e2fb18	258	mutex_unlock(&dev->struct_mutex);
1da177e4	259
b018fcda	260	return -EINVAL;
1da177e4 LT	261	}
1da177e4 LT	262
b5e89ed5 DA	263	/**
	264	* Get statistics information.
	265	*
1da177e4	266	* \param inode device inode.
6c340eac	267	* \param file_priv DRM file private.
1da177e4 LT	268	* \param cmd command.
1da177e4 LT	269	* \param arg user argument, pointing to a drm_stats structure.
b5e89ed5	270	*
1da177e4 LT	271	* \return zero on success or a negative number on failure.
1da177e4 LT	272	*/
c153f45f EA	273	int drm_getstats(struct drm_device dev, void data,
c153f45f EA	274	struct drm_file *file_priv)
1da177e4	275	{
c153f45f	276	struct drm_stats *stats = data;
b5e89ed5	277	int i;
1da177e4	278
246a3d18	279	memset(stats, 0, sizeof(*stats));
b5e89ed5	280
30e2fb18	281	mutex_lock(&dev->struct_mutex);
1da177e4 LT	282
	283	for (i = 0; i < dev->counters; i++) {
	284	if (dev->types[i] == _DRM_STAT_LOCK)
c153f45f	285	stats->data[i].value =
7c1c2871	286	(file_priv->master->lock.hw_lock ? file_priv->master->lock.hw_lock->lock : 0);
b5e89ed5	287	else
c153f45f EA	288	stats->data[i].value = atomic_read(&dev->counts[i]);
c153f45f EA	289	stats->data[i].type = dev->types[i];
1da177e4	290	}
b5e89ed5	291
c153f45f	292	stats->count = dev->counters;
1da177e4	293
30e2fb18	294	mutex_unlock(&dev->struct_mutex);
1da177e4	295
1da177e4 LT	296	return 0;
	297	}
	298
	299	/**
	300	* Setversion ioctl.
	301	*
	302	* \param inode device inode.
6c340eac	303	* \param file_priv DRM file private.
1da177e4 LT	304	* \param cmd command.
	305	* \param arg user argument, pointing to a drm_lock structure.
	306	* \return zero on success or negative number on failure.
	307	*
	308	* Sets the requested interface version
	309	*/
c153f45f	310	int drm_setversion(struct drm_device dev, void data, struct drm_file *file_priv)
1da177e4	311	{
c153f45f EA	312	struct drm_set_version *sv = data;
	313	int if_version, retcode = 0;
	314
	315	if (sv->drm_di_major != -1) {
	316	if (sv->drm_di_major != DRM_IF_MAJOR \|\|
	317	sv->drm_di_minor < 0 \|\| sv->drm_di_minor > DRM_IF_MINOR) {
	318	retcode = -EINVAL;
	319	goto done;
	320	}
	321	if_version = DRM_IF_VERSION(sv->drm_di_major,
	322	sv->drm_di_minor);
3d77461e	323	dev->if_version = max(if_version, dev->if_version);
c153f45f	324	if (sv->drm_di_minor >= 1) {
1da177e4 LT	325	/*
	326	* Version 1.1 includes tying of DRM to specific device
	327	*/
7c1c2871	328	drm_set_busid(dev, file_priv);
1da177e4 LT	329	}
	330	}
	331
c153f45f EA	332	if (sv->drm_dd_major != -1) {
	333	if (sv->drm_dd_major != dev->driver->major \|\|
	334	sv->drm_dd_minor < 0 \|\| sv->drm_dd_minor >
	335	dev->driver->minor) {
	336	retcode = -EINVAL;
	337	goto done;
	338	}
1da177e4 LT	339
1da177e4 LT	340	if (dev->driver->set_version)
c153f45f	341	dev->driver->set_version(dev, sv);
1da177e4	342	}
c153f45f EA	343
	344	done:
	345	sv->drm_di_major = DRM_IF_MAJOR;
	346	sv->drm_di_minor = DRM_IF_MINOR;
	347	sv->drm_dd_major = dev->driver->major;
	348	sv->drm_dd_minor = dev->driver->minor;
	349
	350	return retcode;
1da177e4 LT	351	}
	352
	353	/** No-op ioctl. */
c153f45f EA	354	int drm_noop(struct drm_device dev, void data,
c153f45f EA	355	struct drm_file *file_priv)
1da177e4 LT	356	{
	357	DRM_DEBUG("\n");
	358	return 0;
	359	}